sql add column

1ALTER TABLE Customers
2ADD Email varchar(255);
3

1ALTER TABLE table_name
2ADD column_name datatype;
3
4--example
5ALTER TABLE Customers
6ADD Email varchar(255);

1ALTER TABLE table_name 
2ALTER COLUMN column_name new_data_type(size);
3

1ALTER TABLE table_name ADD column_name varchar(50);

1ALTER TABLE table_name
2ADD column_name datatype;

1ALTER TABLE dbo.doc_exa 
2ADD column_b VARCHAR(20) NULL, 
3	column_c INT NULL ;